This is a known issue and my 21 JLU Rubicon diesel was at the dealership a couple of weeks ago. They mended the wiring harness and rerouted it to keep it away from that exhaust filter. Unfortunately 4 days later on the trail I got the Christmas lights again and my buddies had to tow me out as we...
So I've got mine in with the dealership right now and they think this may be a result of that line being too close as well. Check this out for example: https://photos.app.goo.gl/nRmwiW4HMxYv54iJ7